What does the cryptic crossword clue "Does this particle actually exist? Chat about that (7)" mean?

The definition is "Does this particle actually exist?". The wordplay uses an anagram. anagram of CHAT (synonym="CHAT") + YON (synonym="YON") = TACHYON The answer is TACHYON.

Does this particle actually exist? Chat about that (7)

Times Cryptic #28678 | 29 Across | 2023-08-10 flower

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